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Andrei [34K]
3 years ago
12

A pea plant is the F1 offspring of a true-breeding plant with purple flowers and a true-breeding plant with white flowers. This

plant is crossed with one that has white flowers (recessive). What percentage of plants in the next generation will likely have white flowers
Biology
1 answer:
alina1380 [7]3 years ago
7 0

Answer:

<h2>50%</h2>

Explanation:

As given;

A true breeding plant with purple flower: PP

A true breeding plant with white flower:  pp

Cross between these parents = PP× pp

Offspring are =Pp, Pp, Pp, Pp( all are heterozygous purple)

Now cross between this plant and recessive white flower (pp)

Pp × pp

Offspring are: Pp, Pp, pp, pp

50% are white and 50 % are purple.

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In a certain plant, tall stems (t) are dominant to short stems (t). a farmer crosses a short-stemmed plant with a heterozygous l
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The answers would be:

Genotype                Phenotype

     Tt                      Tall stemmed

     tt                       Short stemmed

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

<u />

<u>You can read on to see how this was done:</u>

Tall stems (T) are dominant to short stems (t).

First figure out the genotypes of the parents. We have a short-stemmed plant and a heterozygous long-stemmed plant cross.

For short stem to occur, you need 2 pairs of short alleles. So the first parent would have a genotype of tt.

Heterozygous long-stemmed means that the parent has one of each allele. So the genotype of the second parent would be, Tt.

Now we can make our Punnett Square.

tt x Tt

<u>       t        t  </u>

<u>T |  Tt  |   Tt</u>

<u>t  |   tt  |   tt</u>

Let's list down the genotypes and phenotypic results.

Genotype        no.         Phenotype

     Tt                 2           Tall stemmed

     tt                  2           Short stemmed

So from that we can answer the other questions:

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

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